白鹤滩水电站库区巧家县城整体稳定性评价

白鹤滩水电站位于金沙江下游河段,坝址距上游巧家县城约45 km。水电站蓄水之后,巧家县城周边部分地区将被淹没,水位变化幅度为765~825m,该变化有可能造成县城周边斜坡地区边坡失稳,给该地区人们的生产生活造成巨大影响。通过现场调查和研究钻孔资料,对其地层组成进行分析之后,运用数值模拟分析评价该区在水电站蓄水前的稳定性,得出蓄水前研究区处于稳定状态,这与实地调查结果基本一致;并预测分析了研究区在水电站蓄水后的稳定性,得出蓄水之后研究区处于基本稳定的状态,但如遭遇地震等不利因素的影响,须对其进行长期监控,防止地质灾害的发生。

Evaluation of overal stability of Qiaojia county in reservoir area of Baihetan hydropower station

Baihetan hydropower power station is located in the lower reaches of Jinsha River. The distance from dam to Qiaojia county of upper reaches is about 45 km. Some areas surround Qiaojia county will be submerged after the impoundment of the hydropower station.The amplitude of water level variation is from 765 to 825 meters.This change may cause slope instability in surround the county area,and produce great impact on people''s production and life in the region. After site investigation and through the analysis on composition of formation drill,the paper Analyzed and evaluated the stability of study area before hydropower storage through numerical simulation. The conclusion is that study area before hydropower storage is in a steady state. The result is consistent with the results of the field survey.But earthquake may also produce certain influence on the stability of study area.,so it is necessary to carry on long-term monitoring so as prevent the occurrence of geological disaster.